Glaze breaking tool for bushings and bearings



Oct. 24, 1933. w. J. KATTREIN GLAZE BREAKING TOOL FOR BUSHINGS AND'BEARINGS Filed March 7, 1930 INVENTOR William J/fafii'ez'n a Y W& ATTORNEY Patented Oct. 24, 1933 UNITED STATES GLAZE BREAKING TOOL FOR BUSHINGS AND BEARINGS William J. Kattrein, Albany, N. Y., assignor to Watervliet Tool Company, Inc., Albany, N. Y, a corporation of New York Application March 7, 1930. Serial No. 434,006

8 Claims. (01. 2976)- This invention relates to improvements in g1 ze breakers for bearing bushings and the like, and it consists in the novel features which are hereinafter more fully described.

In use, the operative surface of a shaft bearing or bushing eventually becomes crystallized and hardened, as well as becoming worn. Eventually this leads to the necessity of repair which is accomplished by reaming the bearing out to a next larger size, and using a larger sized shaft or wrist pin therein. When the crystallized or glazed surface is reamed, it is so hard as to resist the reaming operation, and sometimes dulls the reamer. To avoid this, the present tool is first introduced into the glazed bore and the cutting faces thereof forced againstthe hard surfaces and then the tool is oscillated in the hearing or bushing, thus virtually scraping and cutting away the glazed or crystallized metal and ex posing the softer metal underneath. When so treated, the reamer may thereafter easily out the bore oversize without undue damage tothe reamer flutes and leave a smooth and clean bore.

One of the objects of the invention is to produce a perfected glaze breaker for worn bearing bushingsand the like which is self-adjustable in operation and wherein. the elements of the acting parts thereof arrange themselves substantially parallel to each other during the operation of glaze breaking in a bore or in the interior of a bushing or bearing.

Another object of the invention is to secure uniform pressure and wear on the interior surface of a bushing lengthwise thereof during the operation of breaking the wear-formed glaze on the operative surfaces of the bearing or bushing.

A further object of the invention is touprevent an uneven distribution of pressure on the -interior surface of a bushing during the operation of a glaze cutting tool.

A still further object of the invention is to have the improved tool simple, efficient, durable and inexpensive to manufacture.

Other objects and advantages will hereinafter appear.

These objects are attained by the device illustrated in the accompanying drawing or by any mechanical equivalent or obvious modification 'of the same.

In the drawing:

Fig. 1 is a front elevation of the improved glaze breaker for bearing bushings and the like when the jaws of the breaker are closed, as when it is not in operation.

Fig. 2 is a top plan view of the acting end thereof in the position shown in Fig. 1.

Fig. 3 is a. fragmentary side View of the improved glaze breaker.

Fig. 4 is a fragmentary front elevation of the improved glaze breaker when the jaws of the same are open and in action in the interior of a bushing, showing the latter inlongitudinal section.

Fig. 5 is a top plan view of the acting end of the improved glaze breaker in the position shown in Fig. l.

Fig. 6 is an illustration, in end elevation, of a bushing, in which the glaze on its interior surface is indicated, and the dotted line, relatively shown, indicates the unglazed surface exposed by the action of the tool in practice.

Like characters of reference denote like parts throughout the several views.

11 designates each of a pair of angled levers,

pivotally connected to each other at their elbow parts as at 12 and terminating at their lower ends in integrally formed handles 13. I The upper ends of said levers 11 have thereon offset flanked end parts, as at 14, which are pivotally connected at their upper ends, as at 15, to the middle portions of the flanges 16 on breaker jaws having thereon a knurled or file cut surface 1'? which is cylindrical or curved on the outer part thereof and arranged to bear on diametrically opposite parts of the interior bearing surface of a bushing 18, which is shown in dot and dash lines in Fig. 5.

The pivotal connections 15 allow the cutting faces 17 of the jaw members to adjustthemselves into a position of parallelism with each other. The position of the pivots 15 at the middle of said flanges 16 produces an equal pressure by said cut ting faces 17 on all parts of the interior of said bushing 18 lengthwise thereof, whereby a perfect parallel cutting action is produced, as illustrated in Fig. 4. I

In Fig. 6 the dotted line '13--.b shows the amount of stock to be removed on a bushing 18a. Of course this View is exaggerated as in actual practice the'amount of material removed, to take out the glazed portion, is usually only a few thousandths of aninch.

In Figs. .2 and 5 it will be noted that this tool may be used in bores of greatly varying diameters. For instance, in Fig. 2 the tool is shown fully collapsed, thus permitting it to'be used invery small diameters, whereas in Fig. 5 the tool is shown expanded to a very; much larger diameter, thoughnot to its extreme expansiloility. v

This is possible by reason of the fact that the cutting faces 17 are each provided with a flange 16 which is located on the outer edges of said faces 1'7 and at right angles thereto, and when assembled as shown in Fig. 2 the spaced flanges 16 form a compartment 16'- in which is located the offset ends 14 of the pivoted hand levers 11. This makes a compact practical device which is capable of being closed to enter av'ery small diam-i eter bearing bore. Further, owing to this construction, the pivotal connection of the reduced lever ends 14 to the flanges 16 of the jaw members by the pivots 15, provides for broad areas of contact between the flanges 16 and the side faces of the lever ends 14 as can be seen at 19 in Fig. 4 whereby to successfully resist torsional resilience during oscillatory rotation of the tool under cut- 1iging pressure and stress during operation in a ore.

It is to be noted that the cutting jaws 16, 17 are duplicates and are reversible, if desired, in their relative operative positions. This is an advantage in the manufacture of this tool.

Many changes may be made in the improved tool without departing from the main scope of the invention, and parts of the invention may be used without other parts. Therefore I do not desire to restrict myself to the details as shown in the drawing, but intend to include all mechanical equivalents and obvious modifications of the same within the scope of the invention.

What I claim and desire to protect by Letters Patent is: I

1. Aglaze breaker for a hollow bearing comprising a pair of pivoted levers having outwardly movable short arms, pivots terminally carried by said arms, flanges movably mounted on said pivots, abrading surfaces integral with said flanges, and manually inwardly movable long arms continuous with said short arms for moving the latter outwardly to urge said surfaces into contact with the inner periphery of the hollow bearing.

2. A glaze breaker for internal surfaces of hollow cylindrical bearings comprising a pair of movable levers having short arms, means pivotally connecting said levers, pivots terminally carried by said arms, abrading members including flanges movably mounted on said pivots, parallel out wardly facing transversely curved abrading surfaces carried by said flanges, and manipulable arms continuous with said short arms for moving the latter outwardly to urge said last mentioned surfaces into engagement with the inner surface of a bearing. I f ,3. A glaze breaking device for the inner surface of a hollow bearing comprising a pair of pivotally movable levers having operating arms, short arms of rectangular cross section continuous with said first arms, pivots carried by the ends of said short arms, flanges mounted on said pivots and movably engaging opposed flatsurfaces of said short arms, right angularly disposed flanges integral with said first flanges, said secondflanges being also disposed adjacent opposed flat surfaces of said short arms, and external abrading surfaces provided on said latter flanges, whereby on inward movement of said operating arms said abrading surfaces-are effective to engage the inner surface of the hollow bearing.

4. In a glaze breaker for the inner periphery. of a hollow cylindrical bearing comprising a pair of pivoted levers, cooperating adjoining arms of rectangular cross section, pivot means carried by the outer ends of the last mentioned arms, and breaker units pivoted on said means and providing a compartment of restricted dimensions for said rectangular arms, so that said units may be moved into the hollow of a cylinder of limited diameter, said units including flanges which engage opposed faces of said adjoining arms, flanges continuous with the respective first mentioned flanges and disposed at right angles thereto, the secondmentioned flanges being disposed j W6 arms, short arms of rectangular cross sect interposed faces of said adjoining arms, and rasping surfaces on the second mentioned flanges.

5. A glaze breaker for the inner periphery of a hollow bearing comprising a pair of straight I relatively movable single members, said members having on their opposed outer surfaces integral rasps, a pair of levers constructed of flat metal ing from the inner ends of said portions and pivotally carrying at their outer ends said members, and a pivot disposed at the. ad'oining ends of the second mentioned terminals and said portions, whereby on moving the first mentioned terminals inwardly the second mentioned terminals may be moved outwardly for engaging said rasps against a periphery as aforesaid.

6. A glaze breaker for the inner surface of a cylindrical bearing comprising in combination pair of pivoted revolvable levers including cooperating short arms having terminal pivot means, said arms being of rectangular cross section and having mutually engaging inner breaker members including elongate flanges which have their longitudinal centers disposed on the plane of said faces, manipulable arms extending from the first mentioned arms whereby to revolve said levers, abrasive surfaces on said flanges for engaging the first mentioned surface, and right angularly disposed eaten 3 rom the first mentioned flanges and pivoted on said means, the second mentioned flanges having their inner faces disposed against the outer faces of said short arms, so as to resist torsional stresses.

7. In a glaze breaker for the inner periphery of a hollow cylindrical bearing comprising a pair of pivoted levers having inwardly movable long arms, short arms of rectangular cross section extending from the first mentioned a ing mutually engaging inner faces, break bers terminally carried by said short a having flanges engaging the outer faces of short armssaid flanges having their inner faces engaging said outer faces, flanges extending inwardly from the first mentioned flanges and disposed at right angles thereto, the second mentioned flanges having their outer boundary portions disposed on the plane of the outer f ces of the first mentioned flanges, and rasping surfaces integral with the second mentioned flanges.

8. In a glaze breaker for the inner periphery of a hollow cylindrical bearing co; risng a pair of pivoted levers having inwardly movable long tending from the first mentioned arms a mutually engaging inner faces, pivot ans terminally carried by said short arms, breaker me; ibers including flanges having theirinner faces engaging the outer faces of said short said flanges being pivoted on said means, flanges X- tending inwardly from the first mentioned and disposed at right angles thereto, the second mentioned flanges having their outer portions disposed on the plane of the outer facesof the first mentioned flanges, rasping surfaces integral with the second mentioned flanges. WILLIAM J. KATTREIN. 

